It was always a good tradition of T3BOARD, that there were people doing sessions in the evening. Either some cool features got coded together or someone presented a solution to a particular problem.
For T3BOARD19 we will have a room for our sessions, made available by the hotel. Our hotel also provides us with a silver screen.
There will also be a dedicated 'session-beamer' for your purpose.
Session planning will be held during dinner (or directly after) in barcamp style.
Sometimes, werewolves could appear after the sessions ... ;)